Mold form structure



Jan. 16, s c W Y MOLD FORM STRUCTURE Filed April 4, 1931 INVENTOR, ffi/W/f/ C/W/e y.

ATTORNEYS.

Patented Jan. 16, 1934 UNITED STATES PAT E" 'i to Floor Accessories City,

Company, 1 llnc., Kansas Mo., a corporation of Missouri Application April 4, 1931. a Serial No. 527,822

'7 Claims.

This. invention relates to mold form structures and .the' partsxthereof, aswell as to the novel combination of the. elements making up a com- 'plete form structure.

.Therprlmary object of the invention is the provision of a novel article of manufacture which may be utilized in constructing a mold form, to such an extent that a vast amount of material saved; time required and expense is reduced materially; and a more efficient and practical formmay be. constructed when the features of the. invention are employed therein.

It is well' known in this art that mold form structures are built up to present a pair of walls, each of which incorporates a plurality of boards disposed in edge to edge relation, some of said boards having their ends in abutting relation to'otherboards in the form wall. No form can be practically constructed without encountering '20 this condition. Heretofore splicing, blocking,

andother' formsof means for holding together the form wall where end-abutting boards are present' have been used but without a great amount of success. Trouble in the form of loss of time, material and the like is always encountered, all of which a mold form structure embody- 'ing the features of this invention obviate. A manner of practicing the invention and an understanding of its component parts is best understood by detailed description, which will be incorporated in the following specification with a; full-understanding of the operation of a form structure embodying the invention.

In the accompanying drawing:

*Figure 1 is a perspective View of a mold form structure built in accordance with this invention.

*Fig. 2--is a fragmentary, vertical, cross section through a portion of one wall of the form, taken along line 11-11 of Fig. 1.

Fig. 3 is an enlarged perspective view of a spreader end tie bar made in accordance with this invention and best adapted for use as one of the elements of anew combination.

Fig.4 isa perspective view of the novelly constructed key member, and,

*Fig. 5 isa like View of a key member formed in accordance with a modified form of the invention.

In referring to the various parts of the drawing, like reference characters will be used to designate similar elements throughout the several views. Description of the invention as the same is embodied in a concrete wall mold form structure will be set down herein because the most common embodiment is to. be. found therein. As is customary, the mold formstructure comprises a pair of spaced walls '8aandnl0', each of which is built up of a plurality of boards: 12: disposed in edge to edge relation. .That is' to say, boards 12 are positioned in a verticalplane-with their longitudinal edges adjoining-as illustrated in Fig. 1. It is obvious and well known in'practice-that such walls as those indicated at Sand 10 cannot be economically built without the use of boards 12, which do not have-their ends 14. in abutting: relation at one oranoth'er' of supports 16. In. View of the desirability to' utilize boards 12 of standard lengths and 'thedesire to eliminate cutting to length, certain boards 12 of walls 8 and 10, have their ends- 14 abutting-the ends of certain other boards12. At this point of juncture a most important feature of this'invention is brought into-play.

A plurality of spreaderand tie bars 18, each formed in a 'novel manner, extend transversely of form walls 8- and 10, project between the edges of boards 12 and therebeyondfor a short distance, as shown in'Figs. 1 and 2. An opening 26 is formed through bar 18'between each projected end ther of and the outer face of the adjacent wall when the parts are in assembled, operation relation. As illustrated in'Fig. 3, each opening 20 is elongated longitudinally of bar 18 and has a length great enough to compensate for a variation of thickness on the part of boards 12.

To serve the purpose of a spreader bar, bar 18 is provided with integral means 22 which engage the inner face of walls 8 and 10. This means 22, in the instance herein illustrated, is in the form of laterally extending lugs struck from the body of bar 18. Generally speaking, bars 18 enter into the structure making up a mold form in the manner shown in 'Fig. 1. In ordinary instances, boards 12 comprising walls 8 and-10 are held against lugs 22, and tied to each other by a key 24, formed to present a contacting'face 26, opposed by an angled face 28 which bears against the end 30 of opening 20 as the same is placed and driven to a securing position. Key 24 is readily removable when the Wall has been poured, which facilitates removal of boards 12, after which bar 18 is broken cliflush with the face of the wall formed within the molding by breaking the same transversely across the narrowed portion formed by the striking up of lugs 22.

Placing of bars 18 and keys 24 when building a mold form is comparatively simple when it is unnecessary to contend with two end-abutting boards 12. It is desired to rigidly hold end-abutting boards 12 against bulging at their line of abutment. It is always necessary to provide some form of splice which has heretofore been attended with troublesome problems. Usually wooden blocks are used and nailed in position to overlap the ends of abutting boards 12. This expedient naturally adds another board thickness to either wall 8 or 10 and therefore key 24 at the point of splice must be moved outwardly an increasing distance.

As mentioned, one of the objects of this invention is to provide novel means for securing abutting boards in rigid condition. This object is obtained without altering the construction of bars 18. In building a mold form in accordance with the concepts of this invention, all bars 18 are identical and the speed is attained through such point of advantage.

Specifically, when abutting boards 12 are to be supported, it is but necessary to position a bar 18 above and below abutting ends 14 of boards 12. These upper and lower bars should intersect the projected plane of the abutting ends. When bars 18 are so positioned, the lower one is of course placed before the board 12 next above the abutting boards is positioned. A special key 32 is passed into opening 20 of the bar 18 below abutting ends 14, which key is formed to present a plate 34 having an area great enough to overlie a portion of each board 12 adjacent the abutting ends 14 thereof. This plate 34 extends across the line of connection and spans the same, as illustrated in Fig. 1. Plate 34 is an integral part of special key 32; is of a thickness just sufficient to withstand the outward pressure and is of a size sufficient to seal any space which might be left between the ends 14 of abutting boards 12. After this special key 32 has been placed, bar 18 thereabove is positioned and then board 12 di"- posed thereon. At this point in the construction, key 24 is moved into opening 20 of the upper bar 18 and downwardly over the top of plate 34. Thus a perfect seal and rigid connection is affected without the use of any other form of splicing mechanism. Special key 32 includes a finger 36 which projects from plate 34 at one edge thereof intermediate the ends of said edge. A rib 38 is formed on one face of plate 34 in longitudinal continuation of finger 36 and adds to the strength of plate 34. One edge 40 of finger 36 lies in the same plane as face 42 of plate 34, while the opposite edge 44 of finger 36 is angled from the thickest portion of said finger to the free end thereof. That is to say, the finger progressively increases in thickness between edges 40 and 44 as the point of connection at the edge of the plate is approached. To provide a blow-receiving face which may be used to drive special key 32 to position, a lug 46 is provided at the point of juncture between finger 36 and rib 38.

The key 24 shown in Fig. 4 is precisely the same as that illustrated in Fig. 4 with the exception of integral plate 34 and in the manufacture of the article, both forms may be made from a key like 24 by employing steps which are well known to any skilled mechanic. As an example, a portion of key 24 may be cut away to receive plate 34 and then the two parts of the special key welded, brazed, or otherwise connected.

In addition to the advantageous features set forth above, it is notable that but a single opening 20 is necessary to be formed through bar 18 adjacent its ends. The keys contemplated herein may all be used again; no cutting of blocks is necessary; no material is wasted and no boards need be sawed or cut when building the mold form embodying the features of this invention.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

l. A mold form structure comprising, a pair of spaced walls, each having a plurality of boards disposed in edge to edge relation; certain boards in each wall being positioned to abut the ends of certain other boards; a plurality of spreader and tie bars extending transversely of said form walls between the edges of abutting boards and projecting therebeyond; means for receiving a key positioned between each projected end of each bar respectively and the outer face of the adjacent wall; and a key member in each receiving means; a tie member being above and below respectively the end-abutting boards near the point of abutment; the key carried by the lower-most tie member having an integral spanning plate whereby to bridge the joint between said abutting-board ends; the key carried by the spreader and tie bar above the end-abutting boards having a portion thereof extending over said spanning plate of the key therebelow.

2. In a mold form structure, a pair of spaced walls, each having a plurality of boards disposed in edge to edge relation; certain boards in each wall being positioned to abut the ends of certain other boards; a spreader and tie bar extending transversely of said form walls between the edges of said end-abutting boards and the edge of the board n Xt above and below respectively; means between the projected ends of said bars and the outer face of the adjacent boards for receiving a key; and a key associated with said receiving means having a spanning plate integral therewith bearing against the end-abutting boards adjacent their abutting ends.

3. In a mold form structure, a pair of spaced walls, each having a plurality of boards disposed in edge to edge relation; certain boards in each wall being positioned to abut the ends of certain other boards; a spreader and tie bar extending transversely of said form walls between and be yond the longitudinal edges of said end-abutting boards and the longitudinal edge of the boards next above and below respectively; means supported by the said bars to bear against the inner sides of said Walls to hold the same in spacedapart relation; an opening through each bar between its projected ends and the adjacent face of said walls; and a wedge-shaped key fitted into said opening having a spanning plate formed integral therewith the inner face of the key and plate being in a common plane whereby to hold together the said walls and to force the boards of each wall respectively against the means bearing against the inner sides thereof, as the spanning plate bears against the end-abutting boards of said walls adjacent their abutting ends.

4. As a new article of manufacture, a key for concrete tie bars comprising a plate; and a finger integral with and projecting from said plate at a point intermediate the ends of one side thereof, said finger being wedge-shaped with its thicker portion adjacent its connection to said plate and oppositely disposed striking surfaces formed by said finger adjacent its connection with said plate.

5. As a new article of manufacture, a key for concrete tie bars comprising a plate; and a finger integral with and projecting from said plate at a point intermediate the ends of one side thereof,

said finger being wedge-shaped, progressively decreasing in thickness as the projected end is approached; one side of said finger being in the same plane as one face of the plate.

6. As a new article of manufacture, a key for concrete tie bars comprising a plate; a finger integral with and projecting from said plate; and a rib formed on one face of said plate, said finger and rib being in longitudinal continuation, said finger and rib progressively increasing in thickness as the point of connection at the edge of the plate is approaching and a lug extending outwardly from said rib and finger adjacent the edge of said plate.

SAMUEL C. AWBREY. 

